Until recently, Political Psychology of International Relations has attracted very few scholars' attention in explaining states behaviors and attitudes as a juridical person. In reality, international relations scholarly works, especially related to Intergovernmental organizations, have shown that rational, structural, and functional accounts have failed to fully capture the underline nature of these institutions. A poliheuristic approach doesn't only solve these theoretical shortcomings but also allows for the close examination of states attitudes and behaviors in making choices that would serve as tools for expected interests. This gives a chance to retrospect: how were these bodies created, what were the environmental factors that led to their formations and the nature of founders. Since organizations are adepts of metamorphosis, it is interesting to watch their overall changes. This book present not only the existing views within the subject but also provides additional information which the author has proven to be relevant.